4 cart 1 x (m) 2 cart 2 -2 0 2 4 6 8 10 t (s) Figure 3.5: A collision between two carts.Problem 2: What is the velocity of the center of mass of the system of two carts in example 3.5.1? Select One of the Following: (a) 0m/s (b) 0.5 m/s (c) -0.5m/s (d) 0.167 m/s